So, if you're trying to use his to date dinosaurs, just stop.
By comparing how much carbon-14 there is in the dead organism with the amount in a living one, the age of the dead organism can be estimated.
The half-life of uranium-238 is 4500 million years.
A useful application of half-lives is radioactive dating.
This has to do with figuring out the age of ancient things.
At first glance, it may seem that not enough information was provided to solve this problem.
However, if the half-life value is given for time (t) then the value of (because only half of the original material remains).
When an organism, eg a tree, dies it stops taking in carbon dioxide.
The amount of carbon-14 in the wood decreases with time as it decays into nitrogen with a half-life of about 5700 years.
And if you type that in your calculator you'll find that this specimen is 700, oh sorry, 7860 years dead. So that's the way that we can do these calculations. Let's do it a different, let's do a different one.